Development of a New Global Model for Estimating One-Minute Rainfall Rate

Singh, Randhir; Acharya, Rajat

doi:10.1109/tgrs.2018.2839024

Cited by 8 publications

(2 citation statements)

References 24 publications

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“…Many studies have been conducted in Malaysia [5]- [8], but the continuous effort is still required due to constant changes in the global climate. This situation is primarily due to global warming, which causes worldwide rainfall patterns to shift [9]. Communication systems are subjected to numerous fade occurrences under heavy rain.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Ka-Band Rain Attenuation for Satellite Communication in Tropical Regions Through a Measurement of Multiple Antenna Sizes

et al. 2020

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The Ka-band is modifying the mode of legacy communication towards versatile satelliteoriented systems with the beam-spot capability and a high-throughput architecture to provide twice the capability of classic Fixed Satellite Service (FSS) satellites, thus significantly reducing the cost per bit. Given this background, the contribution of precipitation rate and Ka-band downpour attenuation are expected to improve statistical models for effect prediction. The International Telecommunication Union (ITU) and local researchers are working tirelessly to determine the best prediction model for tropical climates. However, persistent and continuous efforts are required because currently available models do not perform well. The current prediction model for large datasets exhibits a certain deviation. Direct beacon measurement has been compared with an available prediction model that analyses rain effects in tropical regions. Theoretically, the size of the antenna and its gain influence the performance of the receiving signal. Size and availability are two factors which cause degradation and outage in the receiving signal. The majority of extant studies focus on a single antenna with a diameter lesser than 2.4m. Theoretically, antennas with a smaller diameter possess a smaller margin in comparison with antennas with larger diameters. This condition could affect the prediction model when the high attenuation causes a rapid outage in a small antenna and lead to the unavailability of measurement results. To study such effects and provide a good recommendation, the current work measures the beacon attenuation data at two locations, namely, Bukit Jalil (Kuala Lumpur) and Cyberjaya (Selangor). The locations are approximately 15 km apart and have antennas from 0.65m to 31.1m in sizes. Analyses using an available prediction model revealed that ITU-R P.618 provides the lowest RMS value of 14.37 with regards to rainfall rate on two selected samples in Malaysia. High-accuracy prediction can be achieved through the contribution of this study, and comparative data can be obtained for future research. This study is an encouraging step towards a highly comprehensive and accurate prediction of tropospheric impairments in Ka-band satellite communications in the tropical region. INDEX TERMS ITU, rain attenuation, Ka-band satellite communication.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Ka-Band Rain Attenuation for Satellite Communication in Tropical Regions Through a Measurement of Multiple Antenna Sizes

et al. 2020

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“…Everywhere in the world, the rate of rainfall varies greatly from place to place. The measurement and accuracy of empirical data enhance the development of rain attenuation for a specific location, which is also reliant on the understanding and accuracy of the rainfall rate [2,[12][13][14][15][16][17]. Due to the inherent enormous fluctuation of rainfall at a particular point, the cumulative distribution of the measured rain rate depends on the rain gauge's sampling time; and rain gauges with short integration time are recommended for radio-climatic observations because they account for these fluctuations on the communication links [18].…”

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confidence: 99%

Derivation of Regression Coefficients and Conversion Factors for 1-Minute Rain Rate Statistics in A Tropical Environment

Igwe¹

2023

JAITA

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An important characteristic of rainfall levels at a particular place is the statistical distribution of rainfall rate. In this paper, 1-minute, 5-minute and 30-minute integration time rainfall data were obtained from three different weather stations in Physics Department, Federal University of Technology, Minna, North Central Nigeria. The aim is to derive regression coefficients and conversion factors for predicting rainfall rate of 1-minute integration time from rainfall rates of other integration times. This was achieved by employing Segal, Flavin and Watson rain rate models. The results obtained revealed that there is a power law relationship between 1-minuterain rate (R1) and the equiprobable 5-minute rain rate (R5); and between 1-minute rain rate (R1) and the equiprobable 30-minute rain rate (R30). Also,it was observed that the values of regression coefficients a and b, and conversion factors Ce and CR derived in Minna were different from values derived at other locations in and outside Nigeria when comparisons were made. These discrepancies are attributed to the differences in climatic conditions between the regions among other factors. Therefore, these findings have further corroborated claims by earlier researchers that different regression coefficients and conversion factors are needed for different locations for 1-minute rain rate conversion.

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Optimal Rain Attenuation Prediction Models for Earth-Space Communication at Ku-Band in North Central Nigeria

Igwe

2022

Springer Proceedings in Physics

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Development of a New Global Model for Estimating One-Minute Rainfall Rate

Cited by 8 publications

References 24 publications

Evaluation of Ka-Band Rain Attenuation for Satellite Communication in Tropical Regions Through a Measurement of Multiple Antenna Sizes

Evaluation of Ka-Band Rain Attenuation for Satellite Communication in Tropical Regions Through a Measurement of Multiple Antenna Sizes

Derivation of Regression Coefficients and Conversion Factors for 1-Minute Rain Rate Statistics in A Tropical Environment

Optimal Rain Attenuation Prediction Models for Earth-Space Communication at Ku-Band in North Central Nigeria

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